Re: [PATCH] config: arm: omap2: remove PROVE_LOCKING from defconfig

2019-02-04 Thread Tony Lindgren
* Lukasz Luba [181113 10:22]: > Hi Tony, > > On 11/8/18 5:59 PM, Tony Lindgren wrote: > > Hi, > > > > * Lukasz Luba [181009 08:36]: > >> PROVE_LOCKING enables LOCKDEP, which causes big overhead on cache and > >> bus transactions. > >> > >> On some ARM big.LITTLE architecutres (Exynos 5433) the

Re: [PATCH] config: arm: omap2: remove PROVE_LOCKING from defconfig

2018-11-13 Thread Lukasz Luba
Hi Tony, On 11/8/18 5:59 PM, Tony Lindgren wrote: > Hi, > > * Lukasz Luba [181009 08:36]: >> PROVE_LOCKING enables LOCKDEP, which causes big overhead on cache and >> bus transactions. >> >> On some ARM big.LITTLE architecutres (Exynos 5433) the overhead is really >> big. >> The overhead can be

Re: [PATCH] config: arm: omap2: remove PROVE_LOCKING from defconfig

2018-11-08 Thread Tony Lindgren
Hi, * Lukasz Luba [181009 08:36]: > PROVE_LOCKING enables LOCKDEP, which causes big overhead on cache and > bus transactions. > > On some ARM big.LITTLE architecutres (Exynos 5433) the overhead is really big. > The overhead can be measures using hackbench which will speed up > by x3 times (11sec

[PATCH] config: arm: omap2: remove PROVE_LOCKING from defconfig

2018-10-09 Thread Lukasz Luba
PROVE_LOCKING enables LOCKDEP, which causes big overhead on cache and bus transactions. On some ARM big.LITTLE architecutres (Exynos 5433) the overhead is really big. The overhead can be measures using hackbench which will speed up by x3 times (11sec -> 3.4sec). When you check transaction on cache